Fastener



FIG. 1 is a perspective view of the fastener.

FIG. 2 is a front plan view (front and back are symmetric) thereof.

FIG. 3 is a side plan view (both sides are symmetric) thereof.

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

CLAIM The ornamental design for a fastener, as shown and described. 